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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/spellcheck/browser/spellchecker_session_bridge_android.h"
#include <stddef.h>
#include <utility>
#include "base/android/jni_array.h"
#include "base/android/jni_string.h"
#include "base/metrics/histogram_macros.h"
#include "components/spellcheck/browser/android/jni_headers/SpellCheckerSessionBridge_jni.h"
#include "components/spellcheck/common/spellcheck_result.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
using base::android::JavaParamRef;
namespace {
void RecordAvailabilityUMA(bool spellcheck_available) {
UMA_HISTOGRAM_BOOLEAN("Spellcheck.Android.Available", spellcheck_available);
}
} // namespace
SpellCheckerSessionBridge::SpellCheckerSessionBridge()
: java_object_initialization_failed_(false), active_session_(false) {}
SpellCheckerSessionBridge::~SpellCheckerSessionBridge() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Clean-up java side to avoid any stale JNI callbacks.
DisconnectSession();
}
void SpellCheckerSessionBridge::RequestTextCheck(
const base::string16& text,
RequestTextCheckCallback callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// This allows us to discard |callback| safely in case it's not run due to
// failures in initialization of |java_object_|.
std::unique_ptr<SpellingRequest> incoming_request =
std::make_unique<SpellingRequest>(text, std::move(callback));
// SpellCheckerSessionBridge#create() will return null if spell checker
// service is unavailable.
if (java_object_initialization_failed_) {
if (!active_session_) {
RecordAvailabilityUMA(false);
active_session_ = true;
}
return;
}
// RequestTextCheck API call arrives at the SpellCheckHost before
// DisconnectSessionBridge when the user focuses an input field that already
// contains completed text. We need to initialize the spellchecker here
// rather than in response to DisconnectSessionBridge so that the existing
// text will be spellchecked immediately.
if (java_object_.is_null()) {
java_object_.Reset(Java_SpellCheckerSessionBridge_create(
base::android::AttachCurrentThread(),
reinterpret_cast<intptr_t>(this)));
if (!active_session_) {
RecordAvailabilityUMA(!java_object_.is_null());
active_session_ = true;
}
if (java_object_.is_null()) {
java_object_initialization_failed_ = true;
return;
}
}
// Save incoming requests to run at the end of the currently active request.
// If multiple requests arrive during one active request, only the most
// recent request will run (the others get overwritten).
if (active_request_) {
pending_request_ = std::move(incoming_request);
return;
}
active_request_ = std::move(incoming_request);
JNIEnv* env = base::android::AttachCurrentThread();
Java_SpellCheckerSessionBridge_requestTextCheck(
env, java_object_, base::android::ConvertUTF16ToJavaString(env, text));
}
void SpellCheckerSessionBridge::ProcessSpellCheckResults(
JNIEnv* env,
const JavaParamRef<jobject>& jobj,
const JavaParamRef<jintArray>& offset_array,
const JavaParamRef<jintArray>& length_array,
const JavaParamRef<jobjectArray>& suggestions_array) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
std::vector<int> offsets;
std::vector<int> lengths;
base::android::JavaIntArrayToIntVector(env, offset_array, &offsets);
base::android::JavaIntArrayToIntVector(env, length_array, &lengths);
std::vector<SpellCheckResult> results;
for (size_t i = 0; i < offsets.size(); i++) {
base::android::ScopedJavaLocalRef<jobjectArray> suggestions_for_word_array(
env, static_cast<jobjectArray>(
env->GetObjectArrayElement(suggestions_array, i)));
std::vector<base::string16> suggestions_for_word;
base::android::AppendJavaStringArrayToStringVector(
env, suggestions_for_word_array, &suggestions_for_word);
results.push_back(SpellCheckResult(SpellCheckResult::SPELLING, offsets[i],
lengths[i], suggestions_for_word));
}
std::move(active_request_->callback_).Run(results);
active_request_ = std::move(pending_request_);
if (active_request_) {
JNIEnv* env = base::android::AttachCurrentThread();
Java_SpellCheckerSessionBridge_requestTextCheck(
env, java_object_,
base::android::ConvertUTF16ToJavaString(env, active_request_->text_));
}
}
void SpellCheckerSessionBridge::DisconnectSession() {
// Needs to be executed on the same thread as the RequestTextCheck and
// ProcessSpellCheckResults methods, which is the UI thread.
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
active_request_.reset();
pending_request_.reset();
active_session_ = false;
if (!java_object_.is_null()) {
Java_SpellCheckerSessionBridge_disconnect(
base::android::AttachCurrentThread(), java_object_);
java_object_.Reset();
}
}
SpellCheckerSessionBridge::SpellingRequest::SpellingRequest(
const base::string16& text,
RequestTextCheckCallback callback)
: text_(text), callback_(std::move(callback)) {}
SpellCheckerSessionBridge::SpellingRequest::~SpellingRequest() {
// Ensure that we don't clear an uncalled RequestTextCheckCallback
if (callback_)
std::move(callback_).Run(std::vector<SpellCheckResult>());
}
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